Magnetic Anisotropy and Intersublattice Exchange Interaction in Er2(Coi_a.Ma;)i7 Intermetallic Compounds

Deryagin, A.V.; Kudrevatykh, N. V.; Moskalev, V.N.

doi:10.1515/9783112494462-005

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“…These RFe2 compounds have also raised interest for the modification of their structural and magnetic properties upon hydrogen insertion [7][8][9][10][11][12][13][14]. They can absorb up to 5 H/f.u.…”

Section: Introductionmentioning

confidence: 99%

Magnetic transitions with magnetocaloric effects near room temperature related to structural transitions in Y0.9Pr0.1Fe2D3.5 deuteride

Paul‐Boncour

Herrero

Shtender

et al. 2021

Journal of Applied Physics

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The structural and magnetic properties of Y0.9Pr0.1Fe2D3.5 deuteride have been investigated by synchrotron and neutron diffraction, magnetic measurements, and differential scanning calorimetry. Deuterium insertion induces a 23.5 % cell volume increase and a lowering of crystal symmetry compared to the cubic C15 parent compound (Fd-3m SG). The deuteride is monoclinic (P21/c SG) below 330 K and undergoes a first order transition between 330 and 350 K towards a pseudo-cubic structure (R-3m SG) with TO-D = 342(2) K. The compound is ferromagnetic, accompanied by a magnetostrictive effect below TC = 274 K. The analysis of the critical exponents indicates a second order type transition with a deviation from the isotropic 3D Heisenberg model towards the 3D XY model. This implies an easy plane of magnetization in agreement with cell parameter variation showing a planar magnetic orientation. A weak magnetic peak is even observed at the order-disorder transition with a maximum at 343 K. Magnetic entropy variations are characteristic of direct and reverse magnetocaloric effects at TC and TO-D respectively.

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